package com.geeyuu.android.customview;

import com.geeyuu.android.R;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

public class InertiaListView extends ListView {

    private static final String TAG = "InertiaListView";

    private final static int RELEASE_To_REFRESH = 0;
    private final static int PULL_To_REFRESH = 1;
    private final static int REFRESHING = 2;
    private final static int DONE = 3;
    private final static int LOADING = 4;

    // 实际的padding的距离与界面上偏移距离的比例
    private final static int RATIO = 2;

    private LinearLayout headView;

    private TextView tipsTextview;
    private TextView lastUpdatedTextView;
    private ImageView arrowImageView;
    private ProgressBar progressBar;

    private RotateAnimation animation;
    private RotateAnimation reverseAnimation;

    // 用于保证startY的值在一个完整的touch事件中只被记录一次
    private boolean isRecored;

    // private int headContentWidth;
    private int headContentHeight;

    private int startY;

    private int state;

    private boolean isBack;

    private OnRefreshListener refreshListener;

    private boolean isRefreshable;

    private String refreshTimeText;

    private View footView;
    
    public boolean isComplete(){
        return state == DONE ? true : false;
    }

    // private Context mContext;

    // private RelativeLayout headContent;

    public InertiaListView(Context context) {
        super(context);
        // mContext = context;
        init(context);
    }

    public InertiaListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // mContext = context;
        init(context);
    }

    public void setRefreshTime(String refreshTime) {
        this.refreshTimeText = refreshTime;
        lastUpdatedTextView.setText("上一次刷新：" + refreshTimeText);
    }

    public void setShowRefreshTime(boolean visible) {
        if (visible) {
            lastUpdatedTextView.setVisibility(View.VISIBLE);
        } else {
            lastUpdatedTextView.setVisibility(View.GONE);
        }
    }

    private void init(Context context) {
        LayoutInflater inflater = LayoutInflater.from(context);

        headView = (LinearLayout) inflater.inflate(R.layout.headview_item, null);
        arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);
        arrowImageView.setMinimumWidth(70);
        arrowImageView.setMinimumHeight(50);
        progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);
        tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);
        lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);
        lastUpdatedTextView.setVisibility(View.VISIBLE);
        refreshHeadView();

        addHeaderView(headView, null, false);

        animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        animation.setInterpolator(new LinearInterpolator());
        animation.setDuration(250);
        animation.setFillAfter(true);
        reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        reverseAnimation.setInterpolator(new LinearInterpolator());
        reverseAnimation.setDuration(200);
        reverseAnimation.setFillAfter(true);

        state = DONE;
        isRefreshable = false;

        initfootView(inflater);
    }

    private Button footViewButton;
    private ProgressBar footViewPB;
    private TextView footViewText;
    private OnFootViewClickListener mOnFootViewClickListener;

    private void initfootView(LayoutInflater inflater) {
        footView = inflater.inflate(R.layout.footview_item, null);
        footViewPB = (ProgressBar) footView.findViewById(R.id.footview_pb);
        footViewText = (TextView) footView.findViewById(R.id.footview_text);
        footViewButton = (Button) footView.findViewById(R.id.footview_button);
        footViewButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (null != mOnFootViewClickListener) {
                    state = REFRESHING;
                    setFootViewRefreshState();
                    mOnFootViewClickListener.onClick(v);
                }
            }
        });
    }

    private void setFootViewRefreshState() {
        footViewButton.setVisibility(View.GONE);
        footViewPB.setVisibility(View.VISIBLE);
        footViewText.setVisibility(View.VISIBLE);
    }

    private void setFootViewInitState() {
        footViewButton.setVisibility(View.VISIBLE);
        footViewPB.setVisibility(View.GONE);
        footViewText.setVisibility(View.GONE);
    }

    public void setFootViewListenter(OnFootViewClickListener onFootViewClickListener) {
        this.mOnFootViewClickListener = onFootViewClickListener;
    }

    public interface OnFootViewClickListener {
        public void onClick(View v);
    }

    private int getHeadViewHeight() {
        measureView(headView);
        return headView.getMeasuredHeight();
    }

    private void refreshHeadView() {
        headContentHeight = getHeadViewHeight();
        headView.setPadding(0, -1 * headContentHeight, 0, 0);
        headView.invalidate();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        if (isRefreshable) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                if (getFirstVisiblePosition() == 0 && !isRecored) {
                    isRecored = true;
                    startY = (int) event.getY();
                    Log.v(TAG, "在down时候记录当前位置‘");
                }
                break;

            case MotionEvent.ACTION_UP:
                if (state != REFRESHING && state != LOADING) {
                    if (state == DONE) {
                        // 什么都不做
                    }
                    if (state == PULL_To_REFRESH) {
                        state = DONE;
                        changeHeaderViewByState();

                        Log.v(TAG, "由下拉刷新状态，到done状态");
                    }
                    if (state == RELEASE_To_REFRESH) {
                        state = REFRESHING;
                        changeHeaderViewByState();
                        onRefresh();

                        Log.v(TAG, "由松开刷新状态，到done状态");
                    }
                }

                isRecored = false;
                isBack = false;

                break;

            case MotionEvent.ACTION_MOVE:
                int tempY = (int) event.getY();

                if (!isRecored && getFirstVisiblePosition() == 0) {
                    Log.v(TAG, "在move时候记录下位置");
                    isRecored = true;
                    startY = tempY;
                }

                if (state != REFRESHING && isRecored && state != LOADING) {
                    // 保证在设置padding的过程中，当前的位置一直是在head，否则如果当列表超出屏幕的话，当在上推的时候，列表会同时进行滚动

                    // 可以松手去刷新了
                    if (state == RELEASE_To_REFRESH) {

                        setSelection(0);

                        // 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步
                        if (((tempY - startY) / RATIO < headContentHeight) && (tempY - startY) > 0) {
                            state = PULL_To_REFRESH;
                            changeHeaderViewByState();

                            Log.v(TAG, "由松开刷新状态转变到下拉刷新状态");
                        }
                        // 一下子推到顶了
                        else if (tempY - startY <= 0) {
                            state = DONE;
                            changeHeaderViewByState();

                            Log.v(TAG, "由松开刷新状态转变到done状态");
                        }
                        // 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步
                        else {
                            // 不用进行特别的操作，只用更新paddingTop的值就行了
                        }
                    }
                    // 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
                    if (state == PULL_To_REFRESH) {

                        setSelection(0);

                        // 下拉到可以进入RELEASE_TO_REFRESH的状态
                        if ((tempY - startY) / RATIO >= headContentHeight) {
                            state = RELEASE_To_REFRESH;
                            isBack = true;
                            changeHeaderViewByState();

                            Log.v(TAG, "由done或者下拉刷新状态转变到松开刷新");
                        }
                        // 上推到顶了
                        else if (tempY - startY <= 0) {
                            state = DONE;
                            changeHeaderViewByState();

                            Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态");
                        }
                    }

                    // done状态下
                    if (state == DONE) {
                        if (tempY - startY > 0) {
                            state = PULL_To_REFRESH;
                            changeHeaderViewByState();
                        }
                    }

                    // 更新headView的size
                    if (state == PULL_To_REFRESH) {
                        headView.setPadding(0, -1 * headContentHeight + (tempY - startY) / RATIO, 0, 0);

                    }

                    // 更新headView的paddingTop
                    if (state == RELEASE_To_REFRESH) {
                        headView.setPadding(0, (tempY - startY) / RATIO - headContentHeight, 0, 0);
                    }

                }

                break;
            }
        }

        return super.onTouchEvent(event);
    }

    // 当状态改变时候，调用该方法，以更新界面
    private void changeHeaderViewByState() {
        switch (state) {
        case RELEASE_To_REFRESH:
            arrowImageView.setVisibility(View.VISIBLE);
            progressBar.setVisibility(View.GONE);
            tipsTextview.setVisibility(View.VISIBLE);

            arrowImageView.clearAnimation();
            arrowImageView.startAnimation(animation);

            tipsTextview.setText("松开刷新");

            Log.v(TAG, "当前状态，松开刷新");
            break;
        case PULL_To_REFRESH:
            progressBar.setVisibility(View.GONE);
            tipsTextview.setVisibility(View.VISIBLE);
            arrowImageView.clearAnimation();
            arrowImageView.setVisibility(View.VISIBLE);
            // 是由RELEASE_To_REFRESH状态转变来的
            if (isBack) {
                isBack = false;
                arrowImageView.clearAnimation();
                arrowImageView.startAnimation(reverseAnimation);

                tipsTextview.setText("下拉刷新");
            } else {
                tipsTextview.setText("下拉刷新");
            }
            Log.v(TAG, "当前状态，下拉刷新");
            break;

        case REFRESHING:

            headView.setPadding(0, 0, 0, 0);

            progressBar.setVisibility(View.VISIBLE);
            arrowImageView.clearAnimation();
            arrowImageView.setVisibility(View.GONE);
            tipsTextview.setText("正在刷新");

            Log.v(TAG, "当前状态,正在刷新...");
            break;
        case DONE:
            headView.setPadding(0, -1 * headContentHeight, 0, 0);

            progressBar.setVisibility(View.GONE);
            arrowImageView.clearAnimation();
            arrowImageView.setImageResource(R.drawable.arrow);
            tipsTextview.setText("下拉刷新");

            Log.v(TAG, "当前状态，done");
            break;
        }
    }

    public void setOnRefreshListener(OnRefreshListener refreshListener) {
        this.refreshListener = refreshListener;
        isRefreshable = true;
    }

    public interface OnRefreshListener {
        public void onStartRefresh();
    }
    
    private boolean isHadFootView = false;

    public void setRefreshComplete(String refreshTime) {
        state = DONE;
        this.refreshTimeText = refreshTime;
        lastUpdatedTextView.setText("上一次刷新：" + refreshTimeText);
        changeHeaderViewByState();

        if(!isHadFootView){
            addFooterView(footView);
            setFootViewInitState();
            isHadFootView = true;
        }else{
            setFootViewInitState();
        }
        
    }

    private void onRefresh() {
        if (refreshListener != null) {
            refreshListener.onStartRefresh();
        }
        setFootViewRefreshState();
    }

    public void autoRefresh() {
        state = REFRESHING;
        changeHeaderViewByState();
        onRefresh();
    }

    // 此处是“估计”headView的width以及height
    private void measureView(View child) {
        ViewGroup.LayoutParams p = child.getLayoutParams();
        if (p == null) {
            p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        }
        int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
        int lpHeight = p.height;
        int childHeightSpec;
        if (lpHeight > 0) {
            childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
        } else {
            childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
        }
        child.measure(childWidthSpec, childHeightSpec);
    }

    public void setAdapter(BaseAdapter adapter) {
        if(!isHadFootView){
            addFooterView(footView);
            setFootViewInitState();
            isHadFootView = true;
        }else{
            setFootViewInitState();
        }
        super.setAdapter(adapter);
    }

}
